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C
AD 746±A
FEATURES
APPLICATIONS
On-chip and remote temperature sensor
0.25°C resolution/1°C accuracy on remote channel
1°C resolution/1°C accuracy on local channel
Desktop and notebook computers
Industrial controllers
Smart batteries
Automatically cancels up to 1.5 kΩ (typical) of resistance in
series with remote diode to allow noise filtering
Extended, switchable temperature measurement range
0°C to +127°C (default) or –64°C to +191°C
Automotive
Embedded systems
Burn-in applications
Instrumentation
Pin- and register-compatible with ADM1032 and ADT7461
2-wire SMBus serial interface with SMBus alert support
Programmable over/under temperature limits
Offset registers for system calibration
THERM
Up to two overtemperature fail-safe
Small 8-lead MSOP
outputs
240 μA operating current, 5 μA standby current
FUNCTIONAL BLOCK DIAGRAM
ADDRESS POINTER
REGISTER
ON-CHIP
TEMPERATURE
SENSOR
CONVERSION RATE
REGISTER
LOCAL TEMPERATURE
LOW-LIMIT REGISTER
LOCAL TEMPERATURE
VALUE REGISTER
LOCAL TEMPERATURE
HIGH-LIMIT REGISTER
REMOTE TEMPERATURE
LOW-LIMIT REGISTER
2
3
D+
D–
A-TO-D
CONVERTER
ANALOG
MUX
REMOTE TEMPERATURE
HIGH-LIMIT REGISTER
BUSY RUN/STANDBY
REMOTE TEMPERATURE
VALUE REGISTER
LOCAL THERM LIMIT
REGISTERS
EXTERNAL THERM LIMIT
REGISTERS
REMOTE OFFSET
REGISTER
CONFIGURATION
REGISTERS
EXTERNAL DIODE OPEN-CIRCUIT
INTERRUPT
MASKING
6
4
ALERT/THERM2
THERM
STATUS REGISTER
ADT7461A
SMBus INTERFACE
1
5
7
8
V
GND
SDATA
SCLK
DD
Figure 1.
Rev. A
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